#include <stdio.h>
#include <utility>
#include <algorithm>


using namespace std;

int seq[212345];
bool seen[212345];
int main(void){
	int n;
	while(scanf("%d",&n) == 1){
		for(int i = 1; i <= n; i++){
			scanf("%d", &seq[i]);
			seen[i] = false;
		}
		int i = 1;
		int cyc = 0;
		while(i <= n){
			if(seen[i]){
				i++;
				continue;
			}
			int j = i;
			do{
				seen[j] = true;
				j = seq[j];
			} while(!seen[j]);
			cyc++;
		}
		printf("%d\n", n-cyc);
	}
	return 0;
}